滨海软土路基承载变形特性数值模拟研究  

作　　者：马思涛 刘元强 吴绍娟 王鹏华 刘亚楠 李华聪 叶毓磊 孙浩 

机构地区：[1]山东省路桥集团有限公司,济南250014 [2]山东科技大学土木工程与建筑学院,青岛266590

出　　处：《科技创新与应用》2024年第16期73-77,共5页Technology Innovation and Application

基　　金：山东省路桥集团有限公司科学基金项目(2023gcb-shsfq-fw-001)。

摘　　要：为分析地下通道施工时滨海软土路基的承载变形特性,以青岛市胶州市上合大道配套交通建设项目为背景,运用有限元软件建立地下通道敞开段三维数值计算模型,研究地下通道敞开段主体结构施工时软土路基的沉降变化规律、箱涵表面的最大剪应力以及土体竖向应力变化规律。研究结果表明,路基沉降主要发生在填土部分,地下通道主体结构两侧的沉降位移较大,水平位移主要发生在坡脚位置及主体结构与填土连接处;主体结构两侧的沉降位移随着填土高度的增加,增大幅度相同;主体结构底部前排桩最大剪应力在土体下一定深度相同,土体竖向应力曲线整体呈“W”型,且随着填土高度的增加而增大,以期为类似滨海软土路基地下通道主体结构施工工程提供参考。In order to analyze the bearing and deformation characteristics of coastal soft soil roadbed during the construction of underground passage,taking the supporting traffic construction project of Shanghe Avenue in Jiaozhou City of Qingdao as the background,a three-dimensional numerical calculation model of the open section of underground passage is established by using finite element software.The settlement change law of soft soil roadbed,the maximum shear stress on the surface of box culvert and the vertical stress of soil during the construction of the main structure of underground passage are studied.The results show that the subgrade settlement mainly occurs in the filling part,the settlement displacement on both sides of the main structure of the underground passage is larger,and the horizontal displacement mainly occurs at the foot of the slope and the connection between the main structure and the fill;the settlement displacement on both sides of the main structure increases by the same extent with the increase of filling height.The maximum shear stress of the front row piles at the bottom of the main structure is the same at a certain depth under the soil,and the vertical stress curve of the soil is in the shape of"W"as a whole,and increases with the increase of the filling height,in order to provide reference for the construction of the main structure of underground passageway similar to coastal soft soil roadbed.

关 键 词：滨海软土路基 地下通道 承载变形 沉降 最大剪应力 

分 类 号：U449.5[建筑科学—桥梁与隧道工程]